错误原因： terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc

This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. 代码：

#include<bits/stdc++.h>
using namespace std;
int T,n,m;
deque<char> s;
deque<char> r;
deque<char> t;
deque<char> a;
char xx,yy;
long long ans=0;
bool pd(deque<char> f)
{
	if(f.size()!=t.size()) return false;
	cout<<f.front();
	while(f.front()==t.front())
	{
		f.pop_front();t.pop_front();
	}
	if(!f.empty()) return false;
	return true;
}
void move(deque<char> f,deque<char> x)
{
	//cout<<f.front()<<' '<<x.front()<<endl;
	if(f.front()=='-')
	{	
		char l=x.front();
		f.pop_front();x.pop_front();
		move(f,x);x.push_front(l);x.pop_back();
		move(f,x);
	} 
	else
	{
		x.push_back(f.front());f.pop_front();
		move(f,x);
	}
	if(f.empty())
	{
		if(pd(x)) 
		{
			ans++;
			if(ans==1000000007) ans=0;
		}
		else return;
		return;
	}
}
int main()
{
	//freopen("string.in","r",stdin);
	//freopen("string.out","w",stdout);
	cin>>T;
	
	for(int i=1;i<=T;i++)
	{
		cin>>n>>m;
		for(int j=1;j<=n;j++)
		{
			cin>>xx;s.push_back(xx);
		}
		for(int j=1;j<=m;j++)
		{
			cin>>yy;t.push_back(yy);
		}
		r.push_back(s.front());s.pop_front();
		move(s,r);cout<<ans<<endl;
		ans=0;
		while(!s.empty()) s.pop_front();
		while(!t.empty()) t.pop_front();
		while(!r.empty()) r.pop_front();
	}
	//fclose(stdin);
	//fclose(stdout);
	return 0;
}